Psychologist Leanne ten Brinke states that people are not good at detecting lies, only achieving about 54% accuracy. Her research focuses on "dark" personality disorders like narcissism and psychopathy, which often involve a propensity for lying. Common beliefs about spotting liars, such as looking for averted gazes or insincere smiles, are unreliable. Research shows no evidence that sketchy eye contact indicates deception. While Duchenne smiles (with crow's feet) are often considered genuine, non-Duchenne smiles can simply be polite, not necessarily deceitful. Detecting liars is possible by observing visible cognitive effort, like excessive "ums" and "ohs" or furrowed brows. A more effective strategy involves asking open-ended questions that require detailed responses. Truth-tellers provide more verifiable details, whereas liars often offer fewer key facts and focus on tangential information. Asking about the verifiability of a statement is a superior method for detecting deception than relying on unreliable physical cues.